refactor(starter): upgrade and move to typescript

internal/testing/__mocks__/all-markdown-remark.ts

@@ -1,52 +1,4 @@
-export default {
-  allMarkdownRemark: {
-    group: [
-      {
-        fieldValue: "typography",
-        totalCount: 1,
-      },
-      {
-        fieldValue: "design inspiration",
-        totalCount: 1,
-      },
-    ],
-    edges: [
-      {
-        node: {
-          id: "08870ea6-bdc8-4ec6-bf72-1e7d4488eb72",
-          fields: {
-            slug: "/posts/perfecting-the-art-of-perfection",
-            categorySlug: "/typography",
-          },
-          frontmatter: {
-            date: "2016-09-01",
-            description:
-              "An Essay on Typography by Eric Gill takes the reader back to the year 1930. The year when a conflict between two worlds came to its term. The machines of the industrial world finally took over the handicrafts.",
-            category: "typography",
-            title: "Perfecting the Art of Perfection",
-            template: "post",
-          },
-          html: "",
-        },
-      },
-      {
-        node: {
-          id: "066adc91-f87a-4e57-9fef-7a677baf5c1d",
-          fields: {
-            slug: "/posts/the-birth-of-movable-type",
-            categorySlug: "/design-inspiration",
-          },
-          frontmatter: {
-            date: "2016-09-01",
-            description:
-              "German inventor Johannes Gutenberg developed a method of movable type and used it to create one of the western world’s first major printed books, the “Forty–Two–Line” Bible.",
-            category: "design inspiration",
-            title: "Johannes Gutenberg: The Birth of Movable Type",
-            template: "post",
-          },
-          html: "",
-        },
-      },
-    ],
-  },
-};
+import edges from "./edges";
+import group from "./group";
+
+export default { group, edges };